Butter is an Android app developed by Difference Lab Inc. (7770 Regents Rd. STE 113-291San Diego CA 92122).

Butter first became available on 25 Nov 2016. It is estimated that Butter has been downloaded between 100000 and 500000 times from the Play Store.

Butter 2.5.6 requires the following permissions:

Allows applications to access information about networks.

Allows applications to access information about Wi-Fi networks.

Required to be able to access the camera device.

Allows an application to modify the current configuration, such as locale.

Allows access to the list of accounts in the Accounts Service.

Allows applications to open network sockets.

Allows mounting and unmounting file systems for removable storage.

Allows an application to read the user's contacts data.

Allows an application to read from external storage.

Allows read only access to phone state, including the phone number of the device, current cellular network information, the status of any ongoing calls, and a list of any PhoneAccounts registered on the device.

Allows an application to read SMS messages.

Allows an application to send SMS messages.

Allows access to the vibrator.

Allows using PowerManager WakeLocks to keep processor from sleeping or screen from dimming.

Allows an application to write to external storage.